remove twemoji & katex usage (#1460)

src/util/twemojify.jsx

@@ -1,60 +1,31 @@
 /* eslint-disable import/prefer-default-export */
-import React, { lazy, Suspense } from 'react';
-
 import linkifyHtml from 'linkify-html';
 import parse from 'html-react-parser';
-import twemoji from 'twemoji';
 import { sanitizeText } from './sanitize';
 
 export const TWEMOJI_BASE_URL = 'https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/';
 
-const Math = lazy(() => import('../app/atoms/math/Math'));
-
-const mathOptions = {
-  replace: (node) => {
-    const maths = node.attribs?.['data-mx-maths'];
-    if (maths) {
-      return (
-        <Suspense fallback={<code>{maths}</code>}>
-          <Math
-            content={maths}
-            throwOnError={false}
-            errorColor="var(--tc-danger-normal)"
-            displayMode={node.name === 'div'}
-          />
-        </Suspense>
-      );
-    }
-    return null;
-  },
-};
-
 /**
  * @param {string} text - text to twemojify
- * @param {object|undefined} opts - options for tweomoji.parse
+ * @param {object|undefined} opts - DEPRECATED - options for tweomoji.parse
  * @param {boolean} [linkify=false] - convert links to html tags (default: false)
  * @param {boolean} [sanitize=true] - sanitize html text (default: true)
- * @param {boolean} [maths=false] - render maths (default: false)
+ * @param {boolean} [maths=false] - DEPRECATED - render maths (default: false)
  * @returns React component
  */
-export function twemojify(text, opts, linkify = false, sanitize = true, maths = false) {
+export function twemojify(text, opts, linkify = false, sanitize = true) {
   if (typeof text !== 'string') return text;
   let content = text;
-  const options = opts ?? { base: TWEMOJI_BASE_URL };
-  if (!options.base) {
-    options.base = TWEMOJI_BASE_URL;
-  }
 
   if (sanitize) {
     content = sanitizeText(content);
   }
 
-  content = twemoji.parse(content, options);
   if (linkify) {
     content = linkifyHtml(content, {
       target: '_blank',
       rel: 'noreferrer noopener',
     });
   }
-  return parse(content, maths ? mathOptions : null);
+  return parse(content);
 }